Pictures of the day: 28 August 2013

An artist's impressions of Leedsichthys, the biggest fish that ever swam in the sea. Calculations based on fragments of fossil skeleton suggest the Jurassic fish grew to eight or nine metres (29 feet) in 20 years and could reach 16.5 metres (54 feet) in 38 years.Picture: R. Nicholls/Paleocreations.com/University of Glasgow/PA